99187878199 has 4 divisors (see below), whose sum is σ = 100584890640. Its totient is φ = 97790865760.

The previous prime is 99187878193. The next prime is 99187878211.

99187878199 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99187878199 - 2²⁷ = 99053660471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99187878193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698506114 + ... + 698506255.

It is an arithmetic number, because the mean of its divisors is an integer number (25146222660).

Almost surely, 2^99187878199 is an apocalyptic number.

99187878199 is a deficient number, since it is larger than the sum of its proper divisors (1397012441).

99187878199 is a wasteful number, since it uses less digits than its factorization.

99187878199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397012440.

The product of its digits is 164602368, while the sum is 76.

The spelling of 99187878199 in words is "ninety-nine billion, one hundred eighty-seven million, eight hundred seventy-eight thousand, one hundred ninety-nine".